9542 and 9543 are 1965 model "Main Line" Westinghouse R36 IRT passenger units built by St. Louis Car, delivered 2/1965. Last new build passenger rail equipment in North America with conventional sash windows, 9543 tested Westinghouse E-Cam DC traction in 1988, later installed on GOH R44s (1991) and now on all R62s, R62As, R68s and R68As. 9542 and 9543 are in the New York Transit Museum fleet.